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Adds experimental (EF9107) ExecuteMerge, ExecuteMergeAsync, ExecuteMergeReturning and ExecuteMergeReturningAsync bulk operators that
insert source rows into a target table and update rows that conflict on a
declared set of columns (an "upsert"), without going through the change
tracker or SaveChanges.
Core: MergeBuilder / MergeUpdateSettersBuilder / MergeInsertSettersBuilder
for Match / WhenMatched / WhenNotMatched, plus the TranslateExecuteMerge
hook and ExecuteMergeMatch.
Relational: MergeExpression / MergeColumnReferenceExpression nodes, plumbed
through QuerySqlGenerator (VisitMerge), SqlNullabilityProcessor and the
shaped-query compiler (including a RETURNING shaper). Base VisitMerge throws;
providers opt in.
SQLite: lowers to INSERT ... ON CONFLICT ... DO UPDATE/DO NOTHING with
optional RETURNING.
Functional tests are included for SQLite (DO NOTHING / DO UPDATE, explicit and
default inserts, RETURNING sync + async, source-key matching, computed-column
exclusion).
Introduces ExecuteMerge, ExecuteMergeAsync, ExecuteMergeReturning and
ExecuteMergeReturningAsync as experimental (EF9107) bulk operators that
insert source rows into a target table and update rows that conflict on a
declared set of columns (an "upsert"), without going through the change
tracker or SaveChanges.
Core:
- MergeBuilder / MergeUpdateSettersBuilder / MergeInsertSettersBuilder for
configuring Match, WhenMatched and WhenNotMatched clauses.
- TranslateExecuteMerge hook and ExecuteMergeMatch on
QueryableMethodTranslatingExpressionVisitor.
Relational:
- MergeExpression / MergeColumnReferenceExpression SQL nodes, plumbed
through QuerySqlGenerator (VisitMerge), SqlNullabilityProcessor and the
shaped-query compiler (including a RETURNING shaper).
- Base VisitMerge throws; providers opt in by overriding it.
SQLite:
- VisitMerge lowers to INSERT ... ON CONFLICT ... DO UPDATE/DO NOTHING,
with optional RETURNING.
Behavior:
- Match honors the source-side key selector, so matching on a differently
named source member produces the correct conflict/insert values.
- The default (no WhenNotMatched) insert excludes computed columns.
Part of dotnet#4526
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An empty WhenNotMatched callback leaves insertProperties empty. For a non-empty source, constructing RowValueExpression(values) then fails because row values must be non-empty; for an empty source the SQLite generator would also produce an invalid empty column list. This clause needs the same explicit empty-setter validation or a defined default-values insert semantics.
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Adds experimental (EF9107)
ExecuteMerge,ExecuteMergeAsync,ExecuteMergeReturningandExecuteMergeReturningAsyncbulk operators thatinsert source rows into a target table and update rows that conflict on a
declared set of columns (an "upsert"), without going through the change
tracker or
SaveChanges.MergeBuilder/MergeUpdateSettersBuilder/MergeInsertSettersBuilderfor
Match/WhenMatched/WhenNotMatched, plus theTranslateExecuteMergehook and
ExecuteMergeMatch.MergeExpression/MergeColumnReferenceExpressionnodes, plumbedthrough
QuerySqlGenerator(VisitMerge),SqlNullabilityProcessorand theshaped-query compiler (including a RETURNING shaper). Base
VisitMergethrows;providers opt in.
INSERT ... ON CONFLICT ... DO UPDATE/DO NOTHINGwithoptional
RETURNING.Functional tests are included for SQLite (DO NOTHING / DO UPDATE, explicit and
default inserts, RETURNING sync + async, source-key matching, computed-column
exclusion).
Part of #4526